"What's more unique about this is the duration", said Kelly Hobelman, a meteorologist with Environment Canada.

In Montreal alone, six heat-related deaths occurred over the weekend, most of whom impacting people living alone, according to CNN. A cool down is expected by Friday with the passage of a cold front.

People at risk of heat-related illnesses include those with chronic illnesses, people with limited mobility or certain mental health illnesses, infants and young children, people on certain medications, and the homeless.

The sweltering heat and suffocating humidity that have blanketed Eastern and Central Canada have contributed to the deaths of at least 17 people in Quebec over the last few days, health officials said Wednesday.

Friday's forecast is for a mix of sun and cloud, a 30 per cent chance of showers and a high of just 27 C and a low of 13 C that will have us all throwing open our windows. "And also keep in mind to make sure you don't leave any people or pets in your vehicle, as temperatures will rise dramatically within minutes".